#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
void reverse_string(char* arr)
{
	if (arr == NULL || *arr == '\0')
	{
		return;
	}
	else
	{
		reverse_string(arr + 1);
		printf("%c", *arr);
	}
}
int main()
{
	int i = 0;
	char arr[] = "abcdef";
	reverse_string(arr);
	printf("\n");
	return 0;
}